I'm in a process of collecting parts for my future FD build. So now a time for fuel system. Some info on car: 93 JDM FD, all stock except PFC and sport catalytic. So I want to stay stock power wise (maybe a bit more around 300 hp with proper tune (already have FC-Tweak) but with new modern parts where is possible to enhace drivability. I plant to go with Radium primary and secondary rails with their FPD and FPR. But I can't decide what injectors do I need. Radium suggests ID but it is a bit overprice for my goal I suppose.
What can you suggest for near stock power with twins if I want to replace stock old injectors for some newer design?

 

Stock is fine. You're going to be well over 1000$ for a fuel system no matter what you do. Stock twins, Stock power, stock injectors. Upgrade the pump and leave everything else alone. If you want to do something injector related, send them out to be cleaned.

Plus, if you plan to keep the sequential system then fitting aftermarket rails is a mission on its own. It's a lot of work.

 

^what he said

KISS

Seen too many people get mod happy or "upgrade" happy and wind up with an unreliable car.

 

So you think better atomization doesn't worth the hassle and money?
I plan to delete ACV since I have O2 feedback off and route air pump directly to catalytic. And I also plan to move rat's nest somewhere from UIM. So fitting isn't an issue I guess.

 

No

 

Years ago, I removed the ACV and installed different fuel injectors on my car for the purpose of running E85 fuel. My first version of the setup had the Xcessive manufacturing lower intake manifold and a single fuel rail (with the OEM primary injector ports blocked off), but I never got acceptable idle or low-RPM behavior with that setup. I added a top-feed fuel rail and very small 300cc/min fuel injectors to the primary location, and now the car can idle super lean even when the engine is cold. But it still smells like a stinky rotary until the cat converter warms up, so I'm not sure I would recommend it unless you are starting without a working fuel system and buying aftermarket parts instead of new OEM injectors. I do like how the car behaves when running E85, but that's not easy to do with a Power FC.

If you're looking for reliability, I would replace all the rubber fuel lines and coolant hoses on the car. And then I would replace the factory radiator and delete the AST. And then make sure the car has fresh sticky tires, and go to some autocross days to get familiar with how it handles. These cars don't have any traction control and they are not nearly as forgiving as most other cars.

 

This ^




Friendly advice, don’t try to recreate the wheel. Sure you can maybe make all that stuff work together at the cost of great time and energy. With little to no return on your investment. While I agree newer injectors have some benefit, you would need an ecu that was capable of adjusting injector timing to really take advantage. The rabbit hole runs deep. Not always worth going down it tho.

The stock injectors are ideal for your target hp and setup plans. Make sure you have the air atomizing hose hooked up for the primary’s and you’ll be fine. If you feel the need to do something with the fuel system, get your injectors cleaned as suggested and replace the FPR and pulsating dampener.

Also, FC tweak is great. If you plan to stay with the power Fc, I would pick up the “Master”.


~ GW

 

Thank you friends